Make a new image, 400 x 400 looks pretty good.
Use the Eclipsce Tool (U) and put a dot in the center.

Apply these blending settings.


Make A selection like below with the Eliptical Marquee tool.
Make a new layer.
Now make a gradient like below.

Drag the line from the top to the bottom of the selection.
Set the layer opacity to 57%.
It should look like this.

Go back to the first layer.
Apply these blending settings. You can also use other patterns.

Rasterize the layer and press Ctrl + U, tick the Colorize box and play around with the settings. I chose a deep blue.
Save it and your done!

This is my first tutorial so go easy.
Click here to see more tutorials!